Magneto plug



H. L HOEGG.

v MAGNETO PLUG.

APPLICATION FILED NOV- 3| 1921.

1,410,25 l Patented Mar. 21, 1922.

j MMM Huot nu,

UNITED srAres ,PATENT OFFICE Application led November 17'0 all whom tmuy concern:

Be it `Known that l, l'lowsiun J. lim-Jian, n citizen of the UnitedStates of America, and resident of l'Veatherly, in the county of Car bonand State of Pennsylvania, have invented certain new and usefulImprovements in Magneto Plugs, of which the following :L specification.

This invention` relates to magneto plugs ot' special utility inconnection with `the construction embodied in the Ford automobile motor,and the said invention has for an object'a provision o't novel meanswhereby u. plug of the character indicated may he conveniently installedand removed, a dcsirable feature when said plug is to be cleaned oradjusted. or when for any other reason it has to be removed. 4.Itis afurtherv` object of this invention to provide a plug of the characterindicated and in' which the plug comprises a plurality ofideta'chableparts, so conneetedtogethcr as topreven't rotation, one with relation tothe other, when the fastening for holding the plug parts in assembledrelation is being manipulated.

It is furthermore an object of this invention to produce a plug of thecharacter indi cated comprising comparatively Yfew inexpensive partswhich can be renewed, shouldV they become worn or broken..

' With vthe foregoing' and other objects in view, the invention consistsin the details of construction, and

fully set forth and claimed.

ln describing the invention in detail, reference will be had to theaccompanying drawingr forming part of this application, wherein likecharacters denote corresponding parts in the several views1 and inwhich- Figure l illustrates a view in elevation of a fragment of a motorconventionally shown, with a device embodying the invention appliedthereto; I

Figure 2 illustrates an enlarged detailed sectional vienr of the plugand its anchoring means;

Figure 3 illustrates a top plan view of the said plug and anchoringmeans;

Figure 4 illustrates a sectional view on a line corresponding with theline 44 of Fia. 2;

lligure 5 illustrates n sectional View on nin. the arrangement 4andcombination of parts to be hereinafter morel Specification of LettersPatent. latenfed lylln 21- 1922 31921. smal No. 512,55.

line correspondingwith the :l-5 'of line corresponding with the line 6 6of Fig.

In thesedrawings .10 denotes a fragment of a' crank case. tofwhich themagneto plugs on, the' type .of, automobile. mentioned are installed. Inapplyngzthe-plug to the case, en anchoring nntll ,has a threadedaperture ofthesxze. ogthe' threaded-:portion: of the p1ug as.w1ll,presently .jappealgl and this anchoring nutis; provided with aseries ofapertures .12' to rec-eivefastenings such as screws althoughthe,^rfnanner,,of attaching, the nut to, the-a5z-mayrbel1anggdy to suit;partie-nlar requirement s ,g1 Iti is.. 1ntendejd that( the nut .l1-shallbe stationedqon theZ 'crank ease ine lpositiongto Epermit-*ftheelectrode' of 1 the plug to. tenter the; aperture: nsu ally,- ormed4;n.,the erank'- case where the magneto ,plugs are now. installed, and.after the nut 'has been so. anchored, the plug ,of this ,invention-maybe -scre`wed into; place ,or removed: bysfun-` :screwing .it `=n Ythesame manner as ,spark telnalfcombustion nbtorSm-i'. mf.,- L-

In.- ;fu'rthen explanation' off .theV manner oi calrying'lthe inventionintopractice, itzis seen-.that. the magnetoplugi-fcomprisesf a body414z-of`:?'shellelike ifor'mf lhaving: a threaded. nppleil whichenters'fthe ,threadedaap'e-rturef'of the nut "115 :The topofvthe body i14,:hns. 'an opening-16', the) walls :of which` 'are Vprcaerably angularly disposed, one with relation to the other, in order that they willconform to the configuration; of the shoulders on the head 17 of aninsulating bushing 18, which insulating bushing fits within the body 14,as' clearly shown in Fig. 2. The bushing has an apertured upper end, theend wall in which the aperture is formed being recessed as at 19, thewall of which recess is of irregular outline to engage shoulders of ahead 20. A threaded shank or post 21 is integral with the head and thispost 21 projects through the aperture in the insulator and serves toretain the body, insulator and post in assembled relation to each other.The irregular configuration at the joints between of n coiled spring neend Secured to thehead and this movable vtfth tlie 'ost when' tliiut 22dis'- engages the three s of the post,v and when this'conilitione'zists, 'the' insulator as well a's the) electode and postqay be dismantled from the body. `The bod has an irregular l externalsurface', 'prefra lyioctagonal, so

*fthenut 'l' could that the shoulders mfa lie-:engaged h aivrelnchothe''like for'serei'vingthe p ug into thentor"fon'relving'ihsthat by the use 'o'fvalivreiiehytlijiflaget plug may The" modification'shownin Fig'. 7' comprisesar electrode 25 having a contact point26,'the' shaink=27 'of iv'h'ich extends into the eonvolutions' 'of thelcoiled electrode, serv-ing to Vhold lthe Aparts in assembled relation,vand under' smef conditions, this contact point might? prove' m'oredesirable than th forni illustrated iii Fig.` 2.

'i o tlie drawing' andl from' the 'foregoing description that the'anchoring nut and magneto' plu'g'ean be manufactured as' eomercia'lproductstobe installed on motors now in' use, andf that 'by h'awng theapertures oi which receive 'the fnstenings i'n such spaced relation toeach other 'as now exists in' the ma eto pini;r flanges which are se'-cured to tie automobile above mentioned, new in' common use',this'improv'edA device be substituted foi'` those plugs which requirethe' removal of all of the anchoring screwsy orl elements prior-'to theremoval of the'- plug.-f By reason of the fact that thislu'gisremovable' from; tlle nut and that i t e iiisulatin seffetedby thebushing, it'

possible to produce' this plug comparaelectrode is therefore re' tivelyinexpensively. und it hns been found to prove advantageous in practice.

I claim:

1. Inta magneto plug for inter-unl comv hustion motors, an anchoringmember having an aperture the u'nll of which is threaded, means foranchoring the member to a crnnk ense, a. bod); having;- a threadednipple to engage the threadsY of the anchoring member, tlie'ni'd bodybeing hollow and having an aperture iu its henri.i the wall of which isof irregular contour, :1n insulating bushing open :it one end und having:in apertured head, .the external surface of the head conformin to theconfiguration of the aperture in theljody :ind fitted therein, the saidapertured end ot the bushing having a seat with 'which the aperturemerges, the said seat having a wall oi irregular` contout, u.' .headfitted to the sent.V e threaded shank carriedy by the head andprojecting through the aperture of' the bushing, n member threaded onthe shank, and an electrode secure'dvtov the head and projecting beyondthe inner end of the bushing.

2. In amagneto plug, a member having; :in upei'turet'he Wa'll of whichis threaded, mefns for securing the member to ncrank case, n plug bodyhaving ai threaded portion engaging the threads of the nnchorinmTmember", the'sid plug bod)1 being open at its inner'end' and having :ishouldered' aperture at the opposite end, a bushingr having an externa-lconfiguration fitting the shoulder und aperture of the body at the outerend, Suid bushing: having nu open inner end and un apertured outer endin the part extending' through the aperture of the body, u terminal postprojectingr through the aperture of the bushing carrying a henri, thesaid hend being sented iu the inner wall nf the bushing neazr its outerend and an elect-rode carried by the said heed and removable from thebushing therewith, and means applied tothe terminal postfor'holding tlreelectrode and bushing in assembled relation to the body.

HOWARD J. HOEGG.

